def __init__(self, cwmin=None, cwmax=None, retrylimit=None, \
usecsma=False, **kwargs):
"""Constructor.
:param cwmin: Minimum contention window size.
:param cwmax: Maximum contention window size.
:param retrylimit: Maximum number of retries allowed.
:param usecsma: Boolean flag; if true, use CSMA/CA without RTS-CTS
reservation messages.
:param kwargs: Additional keywords passed to `configure()`.
The default parameters are specified by the class.
"""
if cwmin is None: cwmin = self.__class__.cwmin
if cwmax is None: cwmax = self.__class__.cwmax
if retrylimit is None: retrylimit = self.__class__.retrylimit
# timing parameters
self.sifs, self.slottime = None, None
self.cwmin, self.cwmax = cwmin, cwmax
self.cslot = None
# events and other members
self.datatosend = None
self.retrycount = None
self.retrylimit = retrylimit
self.usecsma = usecsma
self.rxdata = SimEvent(name=".rxdata")
self._ctsduration = None
self._ackduration = None
# call CSMAC constructor
CSMAC.__init__(self, **kwargs)
self.rxdata.name = "%s.rxdata"%(self.name)
def log(self, event=None, p=None, *args, **kwargs):
"""Overloaded to check verbose level and set common annotations."""
force = False
if ('verbose' in kwargs): force = (kwargs['verbose']>DOT11_VERBOSE)
if self.verbose>DOT11_VERBOSE or force:
kwargs.update(self.get_dcf_anno(p))
CSMAC.log(self, event, p, *args, **kwargs)
def configure(self, **kwargs):
"""Configure downstream ports and `FSM`."""
CSMAC.configure(self, **kwargs)
# add downstream and control ports
self.addport("TXD", tracename=self.tracename+".TXD")
self.addport("RXD", tracename=self.tracename+".RXD")
self.addport("TXC", tracename=self.tracename+".TXC") # control port
# create FSM to manage send/recv execution of DCF
txfsm = self.newchild("txfsm", FSM, tracename=self.tracename+".TX")
rxfsm = self.newchild("rxfsm", FSM, tracename=self.tracename+".RX")
txfsm.goto(self.IDLE)
rxfsm.goto(self.RECV)
# set up timing parameters
self.set_timing()
nav = self.newchild("nav", NAVTimer, tracename=self.tracename+".NAV")
def connect(self, p):
"""Overloaded to connect and call `set_phy()`."""
self.set_phy(p)
return CSMAC.connect(self, p)
